Issue 18, 2016

Unusual anti-bacterial behavior and corrosion resistance of magnesium alloy coated with diamond-like carbon

Abstract

Magnesium and magneisum alloys are promising materials in degradable biomedical implants and also have inherent anti-bacterial ability. A surface coating can reduce the surface corrosion rate of magnesium-based materials without compromising the anti-bacterial properties. In this work, diamond-like carbon (DLC) coatings are deposited on the AZ31 Mg alloy by one-step plasma immersion ion implantation and deposition (PIII&D). After PIII&D, the corrosion current density diminishes largely from 3.17 × 10−4 A cm−2 to 6.53 × 10−5 A cm−2. The pH and amounts of leached magnesium ions are also significantly reduced. Meanwhile, 3 × 104 bacteria seeded on the AZ31-DLC are completely annihilated within 6 hours in contrast to 5 × 103 live ones left on the untreated AZ31 and more than 6 × 108 on Si-DLC (DLC deposited on Si). The favorable anti-bacterial behavior of AZ31-DLC is attributed to the combined effects of favorable bacteria adhesion on the DLC surface and local release of hydroxyl and magnesium ions from the magnesium substrate via defects in the DLC films.

Graphical abstract: Unusual anti-bacterial behavior and corrosion resistance of magnesium alloy coated with diamond-like carbon

Article information

Article type
Paper
Submitted
27 Oct 2015
Accepted
27 Jan 2016
First published
29 Jan 2016

RSC Adv., 2016,6, 14756-14762

Author version available

Unusual anti-bacterial behavior and corrosion resistance of magnesium alloy coated with diamond-like carbon

H. Feng, X. Zhang, G. Wu, W. Jin, Q. Hao, G. Wang, Y. Huang and P. K. Chu, RSC Adv., 2016, 6, 14756 DOI: 10.1039/C5RA22485C

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